dpkg: apache2-common: dependency problems, but removing anyway as you request:
apache2-mpm-prefork depends on apache2-common (= 2.0.55-4.1).
(Reading database ... 39776 files and directories currently installed.)
Removing apache2-common ...
Stopping apache 2.0 web server...Syntax error on line 1 of /etc/apache2/mods-enabled/php5.load:
API module structure `php5_module' in file /usr/lib/apache2/modules/libphp5.so is garbled - perhaps this is not an Apache module DSO?
failed!
invoke-rc.d: initscript apache2, action "stop" failed.
dpkg: error processing apache2-common (--remove):
subprocess pre-removal script returned error exit status 1
Errors were encountered while processing:
apache2-common
E: Sub-process /usr/bin/dpkg returned an error code (1)